Expansion bases¶

An "expansion base" is a board where side-breads and modules can be plugged in. It connects it all together in a specific way, and contains no electronic components itself:

The headers are positioned such that each module will only work in one orientation. When a module is rotated by 180°, neither +5V nor +3.3V will end up being connected. In addition, some of the headers are doubled up to support a mix of 3x7 and 5x7 cm modules.